add ryubuilder

This patch adds ryubuilder:
- avoid writing raw latex for a code block
  set 'sourcecode' or 'console' to rst-class.
- to be able to ommit the number of any chapter
  set 'unnumbered' to rst-class.

To use this builder run the following command:

  make latexpdfryu

Literal block for a source code:

  .. rst-class:: sourcecode

  ::

     import time

     print time.asctime()

Literal block for a console log:

  .. rst-class:: console

  ::

     $ date
     Mon Nov 18 13:15:11 JST 2013

Unnumbered chapter title:

  .. rst-class:: unnumbered

  Overview
  ========

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
replace raw latex code with standard literal block

Use ryubuilder to enable decoration of literal blocks of
the quotation of a source code and console log.

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
add customized cover

To use this cover modify conf.py.

The last parameter of latex_documents[]:

'manual': standard cover
'ryu': customized cover

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>